Aquaculture apparatus includes an elongate tube of flexible translucent plastic material which extends longitudinally along level ground. The tube is inflated and air supported. At least the lower section of the tube defines a water course. The tube is closed at both ends to form a water enclosure. A...http://www.google.es/patents/US6827036?utm_source=gb-gplus-sharePatente US6827036 - Aquaculture
